diff --git a/library/think/App.php b/library/think/App.php
index f8c3d29c..ba102162 100644
--- a/library/think/App.php
+++ b/library/think/App.php
@@ -386,7 +386,7 @@ class App
         } elseif (is_callable([$instance, '_empty'])) {
             // 空操作
             $call = [$instance, '_empty'];
-            $vars = [$$actionName];
+            $vars = [$actionName];
         } else {
             // 操作不存在
             throw new HttpException(404, 'method not exists:' . get_class($instance) . '->' . $action . '()');